Abstract
SiC particulate reinforced Al2O3 matrix composites were fabricated using Directed Metal Oxidation (DIMOX) process. Continuous oxidation of an Al-8.5Si-1.5Mg-9Zn alloy in presence SiC perform with suitable dopants has led to the formation of the Al2O3 matrix. Ceramic composites with SiC volume fraction in the range of 0.35 – 0.43 were evaluated for effective co-efficient of linear thermal expansion (CTE) and elastic properties. The composites with high volume fraction of SiC showed a minimum dilatation with temperature (5.0 × 10−6 /K) and also enhancement in elastic properties (E: 262 GPa; G: 87 GPa; K: 189 GPa). Also, the elastic properties of the ceramic composites increased with SiC volume fraction.
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